@Matt Lord
Definitely some good questions here, Matt.
The "main" benefit is really dependent on what your goals are. From a tax standpoint, people may think that depreciation is the main benefit while others find that 1031 exchanges are the main benefit.
Building depreciation is very slow where component depreciation is more accelerated.
Rental income is taxed at your ordinary rates, just like earned income. The benefit of rentals is there are no payroll taxes taken out.
If you are flipping the house, then yes you will be subject to an additional 15% tax (self-employment tax). But if you are renting the houses, then no you will not be subject to that tax.
There really is no magic formula for eliminating taxes as everyone's situation is drastically different than their neighbor. However, through depreciation you could be cash flowing on your properties but showing a loss on your income taxes.
I would think a single entity would be best. If you do a construction entity you run the risk of showing self employment income subject to the extra 15% tax.